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Plant Growth and Development

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
How are plant hormones used to suppress weeds ?

Synthetic auxins are used to get rid of dicot, such as Dandlions and thistles in areas reserved for monocots such as grain fields. A dicot responds to unnaturally high concentrations of auxins by growing rapidly and then die; whereas monocot, remains unaffected by the treatment.

 


Who isolated auxin and from where ?

Auxin was isolated by F.W. Went from tips of coleoptiles of oat seedling.


What is C/N ratio ?

C/N ratio is the ratio of carbohydrates and nitrogenous compounds which regulate the growth in plants. 

Who coined the term gibberellin ?

Yabuta.

 Term kinetinwas coined by whom ?

Skoog and Miller.

 Give the types of auxins.

Auxins are of two types :

(1) Natural auxins : These are naturally occuring auxins, isolated from plants and are regarded as phytohormones e.g. IAA. NAA etc.

(2) Synthetic auxins : These are synthesized by artificially e.g. IBA 2,4-D etc.